How do you guys test a site after you made some dev task that should not, but might have affected the site? For example an upgrade. I think I just want to do a complete diff-test on the produced HTML for each page on a site. For example between juno.staging.mysite.com and www.mysite.com.

I know there are tools that easily compares a site to a previous saved version of the site, but I havent fond any to compare to another exiting site.

Regards

Jonas